685992623 has 2 divisors, whose sum is σ = 685992624. Its totient is φ = 685992622.

The previous prime is 685992569. The next prime is 685992647. The reversal of 685992623 is 326299586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685992623 - 2¹⁶ = 685927087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685992673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342996311 + 342996312.

It is an arithmetic number, because the mean of its divisors is an integer number (342996312).

Almost surely, 2^685992623 is an apocalyptic number.

685992623 is a deficient number, since it is larger than the sum of its proper divisors (1).

685992623 is an equidigital number, since it uses as much as digits as its factorization.

685992623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 50.

The square root of 685992623 is about 26191.4608794546. The cubic root of 685992623 is about 881.9415735418.

The spelling of 685992623 in words is "six hundred eighty-five million, nine hundred ninety-two thousand, six hundred twenty-three".